Fashionista • Noun
An avid follower of fashion, esp. one who works in the high fashion industry as a designer, model, photographer, etc.; a devotee of clothing trends and fasion

Fed • Noun
Abbrev. federal law enforcement officer

Fence • Noun
1. One who receives and sells stolen goods.
2. A place where stolen goods are received and sold.

• Verb
To sell (stolen goods) to a fence.

FBI • Noun, Abbrev.
Federal Bureau of Investigation

FCC • Noun, Abbrev.
Federal Communications Commission

Forensic • Adj.
1. Relating to, used in, or appropriate for courts of law or for public discussion or argumentation.
2. Of, relating to, or used in debate or argument; rhetorical.
3. Relating to the use of science or technology in the investigation and establishment of facts or evidence in a court of law: a forensic laboratory.

Forensic accounting • Noun
About as exciting as it sounds

Front • Noun
An apparently respectable person, group, or business used as a cover for secret or illegal activities.